VEHICLE SEAT COMPRISING AN AIRBAG DEVICE

An airbag device is achieved in which side cushions that expand and deploy to both sides of a seat behave integrally during a vehicle side collision or the like, and which is capable of stabilizing the position and the like of a member that connects each side cushion during expansion and deployment. An airbag 11 includes:a first side cushion 21 that expands and deploys so as to cover one side of an occupant 5 seated in a vehicle seat 1;a second side cushion 22 that expands and deploys so as to cover another side of the occupant 5; anda connecting member 23 that has through-holes 24 into which attachment members 6 for attaching a headrest 4 to a backrest section 3 of the seat 1 can be inserted, and that connects the first side cushion 21 and the second side cushion 22. During expansion and deployment of the airbag 11, the attachment members 6 are inserted into the through-holes 24 of the connecting member 23.